What would happen if over 2/3rd of humanity simultaneously saw the same vision and heard the same words (in their heads)?

You sound as desperate as Screwtape: "surely our plans will win, since we don't understand Love". We are not uninformed of the devil's schemes; Puddleglum was the one who helped prepare me for the plan you outline.

You don't "have to" do anything to enter the kingdom of heaven, just like you don't have to do anything to go into (or out of) the realm of the satan. We act according to our will, and your will can change, and when it does it won't be by force but by persuasion and wooing. I am preparing you for that by letting you ask whether it is logistically possible for your will to change, if the realm is not that strawman you paint of suckups and self-righteous. Remember, every criterion you desire for your life has been smuggled in from the side of good: even "ease" of service is a good thing and our yoke is the easier one, our burden is light.

I am stepping away for a moment. Seek the Lord while he may yet be found, call upon him while he is near.